The foam in those boats is what is preventing the SE of England from dissappearing under rising seal levels!
I got an 11' one. We spent 6 months at a silly angle in a shed with multiple holes along the transom, and I've no idea how much water got out, but suffice to say we could lift it as opposed to the 4 people it needed to drag it up the beach on it's trolley before.
Every screw etc was taken out & re- sealed, all fibreglass imperfections removed. One half hour trip later & we were back to square one.
Having done that twice, we're now looking for an Avon W350 / 400 or equivalent to replace it.
PS anyone want an 11' dory, 2 careful owners?